American Association for Aerosol Research - Abstract Submission

AAAR 35th Annual Conference
October 17 - October 21, 2016
Oregon Convention Center
Portland, Oregon, USA

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In Situ Observations of Organic Molecules at the Gas-Aerosol Interface

V. FAYE MCNEILL, Yajing Wu, Wanyi Li, Bolei Xu, Xia Li, Hannah Wang, Hai-Lung Dai, Yi Rao, Columbia University

     Abstract Number: 116
     Working Group: Aerosol Chemistry

Organic molecules at the gas-particle interface of atmospheric aerosols can determine the heterogeneous chemistry and climate properties of the aerosol. However, probing the chemistry of the particle surface in situ has proven challenging, given a lack of suitable surface-sensitive analytical techniques. We employed a surface-sensitive technique, Second Harmonic Scattering (SHS), to successfully observe organic molecules at the gas-particle interface of laboratory-generated aerosols. As an example, we directly detected trans-4-[4-(dibutylamino)styryl]-1-methylpyridinium iodide (DiA4) at the gas-particle interface of laboratory generated submicron aerosols with the SHS technique, and employed it as a probe molecule to investigate the presence of other organic species at the gas-aerosol interface.